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I just switched to a mule tape single line suspension utilizing a carbiner at each hammock end and use a marlinspike hitch to attach the biners to the ridge line where the carabiner takes the place of a toggle or spike.
I wrap several times and can then use the wraps and carabiners to attain a 3:1 advantage. This also allows the line to self tension which makes adjustments pretty fast. Now that I have my marlinspike hitch points marked with a sharpie I always have the same sag. I've done three nights this way and plan to do this weekend as well.
Sometimes the tensioned lines will roll, but not the line around the trees.

The trees in my area have very thick and hard bark so protection isn't an issue in most areas. And with multiple wraps it wouldn't be much of an issue unless the tree was very young.